CN110168227A - Multi-stage roots pump - Google Patents
Multi-stage roots pump Download PDFInfo
- Publication number
- CN110168227A CN110168227A CN201880006099.2A CN201880006099A CN110168227A CN 110168227 A CN110168227 A CN 110168227A CN 201880006099 A CN201880006099 A CN 201880006099A CN 110168227 A CN110168227 A CN 110168227A
- Authority
- CN
- China
- Prior art keywords
- pump
- stage roots
- stage
- connecting pipe
- chamber
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000005192 partition Methods 0.000 claims abstract description 18
- 238000010276 construction Methods 0.000 claims description 6
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 239000004744 fabric Substances 0.000 claims description 2
- 238000005096 rolling process Methods 0.000 description 6
- 238000004140 cleaning Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
- F04C23/001—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids of similar working principle
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C18/082—Details specially related to intermeshing engagement type pumps
- F04C18/084—Toothed wheels
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
- F04C18/126—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with radially from the rotor body extending elements, not necessarily co-operating with corresponding recesses in the other rotor, e.g. lobes, Roots type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/12—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2240/00—Components
- F04C2240/30—Casings or housings
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
Abstract
A kind of multi-stage roots pump, includes multiple pump chambers (14) in pump case (16,18).Pump chamber constitutes corresponding pump stage (26,28,30,32,34), wherein each pump stage includes two bidentate rotary-pistons (10).Pump stage (26,28,30,32,34) is separated from each other by partition wall (44).The connecting pipe (48) substantially radially extended is arranged in partition wall (44).Connecting pipe (48) is connect with room (40) are flowed into, and the inlet opening (42) for flowing into room (40) has the cross section bigger than connecting pipe (48).
Description
[technical field]
The present invention relates to a kind of multi-stage roots pumps.
[background technique]
Lobe pump includes the bidentate rotary-piston being for example arranged in pump chamber.Two rotary-piston edges that each pump chamber provides
Opposite direction driving, so that gas is entered by individual room via main-inlet and is discharged via primary outlet.Here, main-inlet
And primary outlet is extended in a radial direction and is positioned relative to each other.Furthermore it is known that multiple tooth rotary-piston, especially includes three
A or four teeth rotary-piston.Here, same, gas is substantially radially pumped into radial arrangement from the main-inlet radially arranged
Primary outlet.
Furthermore it is known that multi-stage roots pump is for obtaining low-pressure.Such every level-one of lobe pump includes a pair of of rotary-piston.?
This, gas to be pumped is transported to the entrance of adjacent pump stage from the outlet of pump stage.This is realized by connecting pipe.Connecting pipe can
To be arranged in the shell of lobe pump, as described in US 2010/0158728, wherein connecting pipe is around pump chamber, rotation
Piston is arranged in pump chamber or is arranged radially at outside pump chamber.This be by gas from the lower area for being arranged in lobe pump
The outlet of pump stage be transported to needed for the entrance of the adjacent pump stage in opposite (such as top) region for being arranged in lobe pump.This
The shortcomings that class lobe pump, is that the construction of pipeline in the housing is technically complicated.In addition, shell must have big volume
To accommodate connecting pipe.This does not only result in the big external dimensions of lobe pump, and relates particularly to high cost.High cost is not only
It is attributed to complex fabrication process, and is also due to required a large amount of metals.
In addition, being pumped according to multi-stage roots known to WO 2013/023954, wherein rotary-piston includes three or more teeth.
Here, the connecting pipe between adjacent pump chamber, which is arranged in, to be made in adjacent pump chamber partition wall separated from each other.Due to providing each rotation
It turns a work and fills in three or more teeth, therefore connecting pipe can be only disposed axially in partition wall.Due to this of connecting pipe
Axial arrangement is only possible in the case where three teeth or multiple tooth rotary piston pump, therefore the shortcomings that such pump is, suction
Ability is less than the suction capactity of the lobe pump with bidentate rotary-piston.
According to another lobe pump known to US 2005/0089424 with three tooth rotary-pistons.This is multi-stage roots pump,
In individually pump stage be separated from each other by partition wall.Connecting pipe between pump stage is arranged in partition wall.Here, connecting pipe
With Z-shaped construction.Therefore, connecting pipe includes entrance area, the join domain radially extended and axially extending outlet area
Domain.This causes high flow capacity to lose.
[summary of the invention]
The object of the present invention is to provide a kind of multi-stage roots pumps that high suction capactity can be obtained by means of it.According to this hair
Bright, this purpose is realized by being pumped according to the multi-stage roots of technical solution 1.
Multi-stage roots pump according to the present invention includes the multiple pump chambers being limited in pump case.For limiting two of pump stage
Bidentate rotary-piston is arranged in each of pump chamber.Adjacent pump stage is separated from each other by partition wall.For making adjacent pump stage
The connecting pipe being connected to each other is arranged in partition wall.According to the present invention, connecting pipe is constructed such that at least one connection
Pipeline, preferably all connecting pipes are connect with the axial room that flows into, by the connecting pipe, the pump of the medium that is conveyed from pump stage
Room is flowed into via inlet opening and flows into room.According to the present invention, inlet opening is constructed such that the cross section of inlet opening
Greater than the cross section of connecting pipe.In the help of the construction of the multi-stage roots pump according to the present invention with bidentate rotary-piston
Under, high suction capactity can be obtained.By providing the inflow room including big inlet opening, even if being arranged in separation in connecting pipe
In wall and therefore in the case where shorter, it also can reduce flow resistance.This reduces the power consumption of pump, and increases suction energy
The efficiency of power and therefore increasing pump.
Since according to the present invention, this is the lobe pump for including bidentate rotary-piston, it is therefore preferred to, between two pump stages
Connecting pipe be substantially particularly only arranged radially in partition wall and completely in partition wall and extend.Therefore, connecting tube
Road particularly includes the pipe section only radially extended.It is arranged it is particularly preferred that whole connection pipeline is radial, wherein connecting tube
Road is particularly preferably directly connected to the axially upstream inflow room seen in the flowing direction.It is particularly preferred that additionally providing
Axial delivery chamber is preferably also directly connected to the connecting pipe radially extended.Delivery chamber is then via outflow opening under
One pump stage connection, wherein the outflow opening of connecting pipe constitutes the entrance of next pump stage.
Preferably, the inlet opening for flowing into room has the section bigger than the radial passage section of connecting pipe, and especially
It is the cross section bigger than the connecting pipe substantially only radially extended.It is particularly preferred that the cross section of inlet opening is than connection
The cross section of pipeline greatly at least 10%, particularly at least 20% and more preferably at least 30%.
For the flow resistance for further decreasing appearance, it is further preferred that, it is preferable that all sides at entrance opening
Edge preferably also all falls by flow enhuancement mode according to radius at all edges of the transition position flowed between room and connecting pipe
Circle.Preferably, the radius of the part through rounding is greater than 2 millimeters.
It according to another preferred embodiment, sees in the flowing direction, cup is provided in the upstream for flowing into room.Therefore, to be tested
The medium conveyed at least partly initially travel in cup, then its be passed to flow into room in.However, if necessary
Words, cup and the arrangement for flowing into room can make the medium that can also directly advance in inflow room from pump chamber.This construct into
One step reduces flow resistance.The independent invention that cup is independently of the cross section of inlet opening is provided.
According to particularly preferred aspect, the mutually the pair of rotary-piston of cup is radially arranged.This provides an advantage in that be conveyed
Medium when being flowed into cup without being redirected.It is therefore particularly preferred that cup is configured to one of pump chamber
Point, rotary-piston does not protrude into the part simultaneously.It is highly preferred that cup extends across the entire width of pump chamber, so that before medium arrives
In room is possible without flow resistance inflow.
Particularly preferred aspect according to the present invention, the connecting pipe being arranged in partition wall are additionally connect with delivery chamber.
Here, it is preferable that the connection is realized in direct mode, wherein preferably, connecting pipe is only arranged radially in partition wall.
Preferably, delivery chamber includes outflow opening.Here, the cross section of outflow opening is preferably configured such that it is greater than connecting tube
The cross section in road.The cross section of outflow opening preferably bigger than the cross section of connecting pipe 10%, particularly 20% and more excellent
Selection of land 30%.In addition, in the region, equally, edge is preferably rounded as in the region for flowing into room.
Particularly preferred aspect according to the present invention, it is preferable to provide rear chamber.It sees in the flowing direction, is arranged in delivery chamber
Downstream.Here, rear chamber can be arranged and constructed into so that medium is fully or only partially by outflow opening from delivery chamber
It is flowed into rear chamber.Therefore, medium may partly can be directly flowed into next pump chamber from outflow opening, or can be with
Completely or partially first flow into rear chamber so as to then therefrom flow into next pump chamber.Preferably, rear chamber is by structure
It causes so that it corresponds to cup.Particularly, rear chamber is radially arranged preferably relative to the pair of rotary-piston.Here, same
Sample, it is preferred that rotary-piston does not protrude into cup simultaneously, and particularly the entire width across pump stage extends cup.
Particularly preferred aspect according to the present invention, shell include at least one inlet cover.At least one described inlet cover is special
Do not constitute the side wall for flowing into room almost.By opening or remove at least one described inlet cover, can for example be easy for
Cleaning purpose and enter flow into room.In addition, geometry is simplified, this is convenient for system by providing at least one described inlet cover
It makes.
According to preferred aspect, additional inlets lid is provided, for example, its side wall for constituting cup.This side cover Preferably also by
It is configured so that it fully constructs the wall, so that for example cup can be readily entered for cleaning purpose.To, equally, geometry
Shape is simplified, and therefore cheaper manufacture is possible.In addition, pump chamber can be readily entered via the inlet cover of cup.
It is particularly preferred that side cover constitutes the side wall for flowing into room and cup.According to particularly preferred aspect, inlet cover is across at least
Two adjacent pump stages extend, and all pump stages more preferably across multi-stage roots pump extend.
According to preferred aspect, shell includes at least one outlet cap, and outlet cap constitutes the side wall of delivery chamber.Here, outlet
Lid is preferably configured such that it corresponds to inlet cover, wherein particularly, providing the outlet cap for rear chamber, and according to spy
Other preferred embodiment, outlet cap extend across one or more pump stages, especially extend across all pump stages.
[Detailed description of the invention]
Hereinafter, with reference to attached drawing, the present invention is explained in detail based on preferred embodiment, in the accompanying drawings:
Fig. 1 shows signal of the two-stage lobe pump according to the present invention in the different rotary position of the pair of rotary-piston
The cross section of figure,
Fig. 2 shows the schematic perspective longitudinal cross-section of multi-stage roots pump according to the present invention, and
Fig. 3 shows top view, schematically shows the entrance area for flowing into room.
[specific embodiment]
Each pump stage of multi-stage roots pump according to the present invention includes a pair of of rolling piston.The pair of rolling piston includes
Two bidentate rotary-pistons 10.It is respectively arranged on axis 12 and rotates in mutually opposite directions with pumped (conveying) medium.Continuously arrange
The individual rolling piston of pump stage is respectively placed on common axis, so that lobe pump includes two axis 12.Corresponding a pair of of rolling
Rolling piston 10 in piston is arranged in the pump chamber 14 for constituting pump stage.Pump chamber is formed by two housing parts 16,18.Here, shell
Partition 20 provide in the center of two axis 12 so that simple assembling is possible.In addition, shell is provided with 22 He of inlet cover
Outlet cap 24.
It can be seen that shown according to fig. 2 along the schematic longitudinal section of the line II-II of Fig. 1 according to the present invention
Lobe pump is configured to multi-stage roots pump, wherein in the axial direction, provides multiple pump stages 26,28,30,32,34.Individually
The room volume of pump stage reduces from pump stage 26 initially towards pump stage 34.First pump stage 26 is connect with main-inlet 36.Main-inlet 36 with to
Room of evacuation or the like connection.Therefore, the pump chamber that medium to be conveyed passes through 36 radial inflow of main-inlet to the first pump stage 26
In 14.
In radial directions, opposite with main-inlet 36, form cup 38.Cup 38 prolongs across the entire axial width of pump stage 26
It stretches, and therefore there is the width substantially the same with the rolling piston 10 of the first pump stage 26.
Additionally, it is provided flowing into room 40.In shown exemplary embodiment, 40 one side of room is flowed into adjacent to cup 38
Arrangement, and further comprise the inlet opening 42 being directly connected to pump chamber 14.
The connecting pipe 48 inside partition wall 44 is arranged in dispose adjacent to room 40 is flowed into.In Fig. 2, medium to be conveyed
Bottom is flowed to from top in connecting pipe 48.
It is constructed such that it corresponds to the delivery chamber 50 of inflow room 40 and is adjacent in shown exemplary embodiment
The connecting pipe 48 that only radially extends and arrange, and be constructed such that it corresponds to the rear chamber 52 of cup 38 and is adjacent to
Flow into room 40 and arrange.Delivery chamber 50 includes outflow opening 54, in shown exemplary embodiment, the wheel of outflow opening 54
Wide and construction matching inlet opening 42 profile and construction.
In shown exemplary embodiment, all pump stages are structured to so that it corresponds to each other, wherein each pump stage
It is separated from each other respectively by partition wall 44, and in shown exemplary embodiment, 48 cloth of connecting pipe radially extended
It sets in each partition wall 44.Each connecting pipe 48 connects with inflow room 40 and delivery chamber 50 and cup 38 and rear chamber 52 respectively
It connects.
Especially for flow resistance is reduced, flows into the entrance opening 42 of room 40 and preferably there are also the streams of delivery chamber 50
Opening 54 is constructed such that it has the cross section bigger than connecting pipe 48 out.
In addition, inflow room 40 and cup 38 are all connect with shared inlet cover 24.Correspondingly, delivery chamber 50 and rear chamber 52 with
Outlet cap 22 is shared to connect.
Last pump stage 34 is further connect with unshowned primary outlet, and medium to be conveyed is discharged by primary outlet.
In figure 3 it is shown that the schematic top view of inlet chamber 40,40 one side of inlet chamber is connect with cup 38, and another
On the one hand it is connect with connecting pipe 48.In shown exemplary embodiment, entrance opening 42 is formed by curved edge 54.Cause
This, entrance opening has the cross section as shown in dotted line 56.
Can with it is further seen that, flow into 40 one side of room and be directly connected to corresponding pump chamber 14, and another aspect and cup
38 are directly connected to.This is equally applicable to outflow opening 54.
Claims (19)
1. a kind of multi-stage roots pump comprising:
The multiple pump chambers (14) limited by pump case (16,18), two bidentate rotary-pistons (10) are arranged in the pump chamber and use
In construction pump stage (26,28,30,32,34)；
Make the adjacent pump stage (26,28,30,32,34) partition wall (44) separated from each other；And
The connecting tube for being arranged in the partition wall (44) and the adjacent pump stage (26,28,30,32,34) being made to be connected to each other
Road (48),
Wherein the connecting pipe (48) connect with axial flow into room (40), and the medium conveyed passes through inlet opening (42) from pump
The pump chamber (14) of grade (26,28,30,32,34) is flowed into axial inflow room (40), and
Wherein the inlet opening (42) has the cross section bigger than the connecting pipe (48).
2. multi-stage roots according to claim 1 pump, it is characterised in that the connecting pipe (48) is substantially particularly only
Radial arrangement.
3. multi-stage roots pump according to claim 2, it is characterised in that the connecting pipe (48) and the inflow room
(40) it is directly connected to.
4. multi-stage roots pump according to any one of claims 1 to 3, it is characterised in that the inlet opening (42)
Cross section greatly at least 10%, particularly at least 20% and more preferably at least of the cross section than the connecting pipe (48)
30%.
5. multi-stage roots pump according to any one of claims 1 to 4, it is characterised in that preferably, the inflow is opened
It is rounded that flow enhuancement mode is all pressed at all edges of mouth (42).
6. multi-stage roots pump according to any one of claims 1 to 5, it is characterised in that see arrangement in the flowing direction
Cup (38) in the upstream for flowing into room (40).
7. multi-stage roots pump according to claim 6, it is characterised in that the cup (38) is relative to the pair of rotation
Piston (10) is radially arranged.
8. multi-stage roots pump according to claim 6 or 7, it is characterised in that the cup (38) is the pump chamber (14)
A part, the rotary-piston (10) do not protrude into the part simultaneously.
9. being pumped according to claim 1 to multi-stage roots described in any one of 8, it is characterised in that the connecting pipe (48) is special
It is not to be directly connected to delivery chamber (50).
10. multi-stage roots pump according to claim 9, it is characterised in that the outflow opening (54) of the delivery chamber (50) has
There is the cross section bigger than the connecting pipe (48), the medium conveyed flows out to the pump chamber by the outflow opening (54)
(14) in.
11. multi-stage roots according to claim 9 or 10 pump, it is characterised in that the outflow opening (54) it is described transversal
Cross section greatly at least 10%, particularly at least 20% and more preferably at least 30% of the face than the connecting pipe (48).
12. multi-stage roots pump according to claim 11, it is characterised in that preferably, the outflow opening (54) is owned
It is rounded that flow enhuancement mode is all pressed at edge.
13. the multi-stage roots according to any one of claim 9 to 12 pump, it is characterised in that see cloth in the flowing direction
Set the rear chamber (52) in the downstream of the delivery chamber (50).
14. multi-stage roots pump according to claim 13, it is characterised in that the rear chamber (54) is lived relative to the rotation
(10) are filled in radially to arrange.
15. multi-stage roots described in 3 or 14 pump according to claim 1, it is characterised in that the rear chamber (54) is the pump chamber
(14) a part, the rotary-piston (10) do not protrude into the part simultaneously.
16. being pumped according to claim 1 to multi-stage roots described in any one of 15, it is characterised in that the pump case (16,
It 18) include at least one inlet cover (24), the inlet cover (24) constitutes the side wall for flowing into room (40).
17. multi-stage roots pump according to claim 16, it is characterised in that the inlet cover (24) constitutes the cup
(38) side wall.
18. being pumped according to claim 1 to multi-stage roots described in any one of 17, it is characterised in that the pump case (16,
It 18) include at least one outlet cap (22), the outlet cap (22) constitutes the side wall of the downstream chamber (50).
19. multi-stage roots pump according to claim 18, it is characterised in that the outlet cap (22) constitutes the rear chamber
(52) side wall.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE202017001029.1 | 2017-02-17 | ||
| DE202017001029.1U DE202017001029U1 (en) | 2017-02-17 | 2017-02-17 | Multi-stage Roots pump |
| PCT/EP2018/051641 WO2018149598A1 (en) | 2017-02-17 | 2018-01-24 | Multi-stage rotary lobe pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110168227A true CN110168227A (en) | 2019-08-23 |
Family
ID=61054390
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201880006099.2A Pending CN110168227A (en) | 2017-02-17 | 2018-01-24 | Multi-stage roots pump |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US11255328B2 (en) |
| EP (1) | EP3583319B1 (en) |
| JP (1) | JP2020507704A (en) |
| KR (1) | KR102490780B1 (en) |
| CN (1) | CN110168227A (en) |
| CA (1) | CA3053679A1 (en) |
| DE (1) | DE202017001029U1 (en) |
| WO (1) | WO2018149598A1 (en) |
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|---|---|---|---|---|
| GB2088957A (en) * | 1980-12-05 | 1982-06-16 | Boc Ltd | Rotary positive-displacement Fluid-machines |
| GB2137696A (en) * | 1983-04-02 | 1984-10-10 | Leybold Heraeus Gmbh & Co Kg | Rotary vacuum pump |
| JPS6319090U (en) * | 1986-07-23 | 1988-02-08 | ||
| EP1006281A1 (en) * | 1998-12-04 | 2000-06-07 | Kabushiki Kaisha Toyoda Jidoshokki Seisakusho | Multi-stage roots pump |
| EP1479913A2 (en) * | 2003-05-19 | 2004-11-24 | Kabushiki Kaisha Toyota Jidoshokki | Roots pump |
| CN101382137A (en) * | 2007-09-07 | 2009-03-11 | 中国科学院沈阳科学仪器研制中心有限公司 | Multi-stage roots dry vacuum pump discharging directly into atmosphere |
| CN101545487A (en) * | 2008-03-24 | 2009-09-30 | 阿耐思特岩田株式会社 | Multi-stage rotor pump and manufacturing process thereof |
| CN201396281Y (en) * | 2009-03-19 | 2010-02-03 | 孙成忠 | Multistage three-blade Roots vacuum pump |
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|---|---|---|---|---|
| US3198120A (en) * | 1962-10-29 | 1965-08-03 | Waukesha Foundry Co | Multiple positive displacement pump |
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| JP2000205148A (en) * | 1999-01-11 | 2000-07-25 | Toyota Autom Loom Works Ltd | Multistage route pump and manufacture of rotor housing of multistage route pump |
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| JP2005155540A (en) * | 2003-11-27 | 2005-06-16 | Aisin Seiki Co Ltd | Multistage dry-sealed vacuum pump |
| GB0515905D0 (en) | 2005-08-02 | 2005-09-07 | Boc Group Plc | Vacuum pump |
| JP5370298B2 (en) * | 2010-07-14 | 2013-12-18 | 株式会社豊田自動織機 | Roots fluid machinery |
| DE202011104491U1 (en) | 2011-08-17 | 2012-11-20 | Oerlikon Leybold Vacuum Gmbh | Roots |
| FR3001263B1 (en) * | 2013-01-18 | 2015-02-20 | Adixen Vacuum Products | DRY TYPE MULTI-STAGE VACUUM PUMP |
| DE112015004060T5 (en) * | 2014-09-04 | 2017-07-06 | Scoprega S.P.A. | Volumetric compressor |
-
2017
- 2017-02-17 DE DE202017001029.1U patent/DE202017001029U1/en active Active
-
2018
- 2018-01-24 CN CN201880006099.2A patent/CN110168227A/en active Pending
- 2018-01-24 US US16/476,817 patent/US11255328B2/en active Active
- 2018-01-24 WO PCT/EP2018/051641 patent/WO2018149598A1/en unknown
- 2018-01-24 EP EP18701730.6A patent/EP3583319B1/en active Active
- 2018-01-24 JP JP2019540089A patent/JP2020507704A/en active Pending
- 2018-01-24 KR KR1020197023787A patent/KR102490780B1/en active IP Right Grant
- 2018-01-24 CA CA3053679A patent/CA3053679A1/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2088957A (en) * | 1980-12-05 | 1982-06-16 | Boc Ltd | Rotary positive-displacement Fluid-machines |
| GB2137696A (en) * | 1983-04-02 | 1984-10-10 | Leybold Heraeus Gmbh & Co Kg | Rotary vacuum pump |
| JPS6319090U (en) * | 1986-07-23 | 1988-02-08 | ||
| EP1006281A1 (en) * | 1998-12-04 | 2000-06-07 | Kabushiki Kaisha Toyoda Jidoshokki Seisakusho | Multi-stage roots pump |
| EP1479913A2 (en) * | 2003-05-19 | 2004-11-24 | Kabushiki Kaisha Toyota Jidoshokki | Roots pump |
| CN101382137A (en) * | 2007-09-07 | 2009-03-11 | 中国科学院沈阳科学仪器研制中心有限公司 | Multi-stage roots dry vacuum pump discharging directly into atmosphere |
| CN101545487A (en) * | 2008-03-24 | 2009-09-30 | 阿耐思特岩田株式会社 | Multi-stage rotor pump and manufacturing process thereof |
| CN201396281Y (en) * | 2009-03-19 | 2010-02-03 | 孙成忠 | Multistage three-blade Roots vacuum pump |
Also Published As
| Publication number | Publication date |
|---|---|
| EP3583319B1 (en) | 2024-05-15 |
| KR102490780B1 (en) | 2023-01-19 |
| EP3583319A1 (en) | 2019-12-25 |
| KR20190112002A (en) | 2019-10-02 |
| CA3053679A1 (en) | 2018-08-23 |
| JP2020507704A (en) | 2020-03-12 |
| US20190376515A1 (en) | 2019-12-12 |
| WO2018149598A1 (en) | 2018-08-23 |
| US11255328B2 (en) | 2022-02-22 |
| DE202017001029U1 (en) | 2018-05-18 |
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Application publication date: 20190823 |